Upon my arrival I performed a 6 month checkup on 1 heat pump system. Flushed and treated the water removal system, washed the condenser coil using water, cleaned and treated the electrical cabinet then verified system safety and performance. Found the system is performing to manufacture specifications but has bacterial growth inside the air handler. Spoke with the customer about my recommendations on both homes. Due to a recent major repair they had to the main home they will have to continue limping the system along for a bit longer. On the second home customer would like the options emailed over for a chemical cleaning on the air handler.